How to calculate cost, reliability, response time and availability of web services in netbeans ?

Hi friends,
I am undergoing a project on "selection of best web service based on QoS constraints".
I created 3 web services for sorting 5 numbers. Each one has its own method to sort.
Then I created a master web service and a client.
The client uses that master web service. Master web service uses other 3 web services to
sort the 5 numbers in three different ways.
But, please help me. I have to calculate the cost, response time, reliability and availability of each and every web service. Please suggest me how to do that.
How will the master web service do that?